Mill or machine for grinding or pulverizing ore and other materials



R. HUSH. v GRINDING 0H PULVERIZING ORE AND OTHER MATERIALS APPLICATION FILED Aua.12. 1919.

MILL 0R MACHINE FOR Patented Nov. 21, 1922..

Patented Nov. 21, 1922.

UNITED STATES aria.

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RALPH HUSH, OF JOHANNESBURG, TRANSVAAL, SOUTH AFRICA.

MILL OR MACHINE FOB GRINDING OR PULVERIZING ORE AND OTHERMATERIALS.

Application filed August 12, 1919.

To all whom it may concern.

Be it known that I, RALPH HUSH, a subject of the King of Great Britain, and resident of Johannesburg, Transvaal Province, Union of South Africa, have invented certain new and useful Improvements in Mills or Machines for Grinding or Pulverizlng Ore and Other Materials, of which the following is a specification.

This invention relates to mills or machines intended for grinding or pulverizing ore and other materials and more particularly to those types of small mills 0r pulverizers in which the grinding is effected between fixed and rotating discs, employed in laboratories for reducing or pulverizing samples or small quantities of such materials. The invention, either in whole or in part, can, however, be adopted in mills or machines of larger size for reducing ore or like material.

Although the invention is especially suitable for the dry grinding of ore or similar material, it can be utilized in the construction of mills or machines intended to carry out the process of wet grinding.

The principal improvements included in thepresent invention appertain, firstly, to the construction and arrangement of the door, or that part or those parts of the mill. which are opened in order to gain access to the interior of the mill for any purpose, and the means whereby the stationary or fixed grinding disc or element is secured to the said door; secondly, to the construction and arrangement of an adjustable bearing for the spindle which drives the rotating disc, and thirdly, to the construction and arrangement of the locking means for the regulatin spin 1e.

In the accompanying drawings I illustrate a mill embodying the various features of the invention.

In the drawings F ig. 1 is a longitudinal sectional view of.

the machine.

Fig. 2 is a front elevation Fig. 3 is a plan view of the her end of the machine.

Fig. 4. is a section (on line ww Fig. 2) of the outer and inner parts of the door, the inner fixed disc and portion of that part of the frame which provides the grinding chamber.

Fig. 5 is sectionl view of portion of the pedestal and adjustable bearing for that of the machine. grinding chamjections 13, 14, on the or adjusting screw for the driving 1n the front of that part of the frame which Serial No. 317,040.

the cover or adjusting means showing also the lockfor locking said lockillustrated in the drawings hine comprlses, as usual, a

suitable shaped frame l, to carry the bearings 2, 3, for the driving spindle 4. This frame 1, at the one end, is constructed to provide the grinding chamber 5, in which the discs 6, operate to reduce the sample, which latter is passed into the space or cavity 8, between said discs 6, 7, through a feed passage 9, leading from the feed box 10, to the central inlet 11, in the fixed disc 6. The grinding chamber 5 is shown fitted at the bottom with a box or receptacle 12 for receiving the pulverizedproduct as the sample is ground. I

The door is hingedly connected to the frame 1 of the machine down one side of that part which forms or provides the grinding chamber 5. This hinged connection, as shown, may be most conveniently made at the left hand side of the machine by means of top and bottom perforated lugs or prodoor engaging with a common hinge pin 15, the latter extending through upper and lower lugs or projections 16, 17, on the frame one.

he door proper consists of two main parts, an inner part 18, and an outer part is preferably of annular or circular external shape, and beveled peripherally, as shown at 20, to fit a correspondingly bevelled opening 21, formed of a segment or portion of a said inner part 18, when free can move in the outer annular part 19 about the said joint.

he inner part 18 may have the feed box 10 cast or otherwise constructed integral with it, and have the feed passage formed door is constructed peripherally in the form through it. The part 13 has suitably attached to it on the inner side the stationary but adjustable disc 6. This, as shown in Figs. 1, 4, 7, 8 and 11, 12, is effected by providing the fixed disc 6 with say two projections 24, 25, the one 24 preferably placed at one side of the feed passage 9, and the other 25 placed more or less diametrically opposite the first-mentioned one. These projections 24, 25, are tapped or provided with internal screw-threads. The inner face of the inner part 18 of the door is fashioned with recesses 26, 27, to receive the projections 24, 25, on the back of the fixed disc 6. Holes 28, 29, are formed through the front of the inner part 18 leading into said recesses 26, 27. In said holes 23, 29, there are placed bolts 30, 31, which are screwed into the holes tapped in the projections 24, 25, on the disc 6. These bolts 30, 31, serve for securing the fixed disc 6 to the inner part 18 of the door. The inner part 18 of the door is also preferably slightly recessed on the inside, as indicated at 32,-see Fig. 4-to receive portion of the back of the disc 6. This construction and arrangement centres the disc 6 and ensures firm connection between it and the door.

The outer part 19 of the door is constructed on the outside with an appropriately curved bridge piece. 33, which extends from the one and hinged side of the said annular outer part 19 to the other side. This piece 33 is curved in two directions, longitudinally-see Fig. 3-and transversely-see Fig.1so that its exterior front surface is a segment of a sphere whose radius is the same, or substantially the same, as the spherical periphery of the inner part 16 of the door, and struck from the same centre. At the unhinged side, the bridge piece 33 is preferably constructed with a lug or extension 34, in which is formed, an open-ended slot 35. An eye-bolt or the like 36, which is hingedly fixed between lugs 37 formed on the side of the frame 1, is adapted to be placed in engagement with the slot in the extension 34. A clamping nut 38, screwed on the end of the eye-bolt 36, into engagement with the extension 34, serves for securing the door in its closed position. A washer 39 is preferably placed on the bolt 36, between the nut 38, and the lug 34', and the nut 34 may be constructed in one piece with a hand wheel 40, for facilitating the rotation of the same by hand in the operation of opening and closing the door.

In the centre of the aforesaid bridge piece 33 there is formed a preferably smooth hole 41, and on the inner part 18 of the door, opposite the said hole 41, and at the bottom of the feed box 10 there is formed a boss or projection 42. In the said boss 42 there is tapped a hole 43 into which is screwed a stud bolt 44. The said bolt 44 passes through the hole 41, in the centre of the bridge piece 33, and has screwed upon its outer end an interiorly threaded hand-wheel or nut 45. Between the nut 45 and the bridge piece 33, there is placed a concave washer 46, the edges of the inner face of which fit the external curvature of the bridge piece These parts form the adjustable connection between the inner part 18 and the outer part 19 of the door, the clearance between the bolt 44 and the hole 41 permitting of any requisite relative adjustment.

On the outside of the annular outer part 19 of the door there are formed projections 47, 48 which serve as stops for said inner part 18 of the door, by engaging with the sides of the feed box 10. This prevents rotation of the said inner part 18 in the outer part 19.

The top of that portion which provides the grinding chamber 5, is preferably made level or straight and stepped or recessed, as indicated at 49, and the cover or lid 50 is made flat to fit therein. 51 is the hinge pin for the one side of the cover 50, and 52 is a spring catch for tightly securing the cover 50 in its closed position. is a hole in the cover 50, for the insertion of a. compressed air pipe to blow out the grinding chamber 5 after grinding a sample, in order to clean out the machine. 54 is a pivoted lid for the hole 53.

The discs 6, 7, which I prefer to use with my machine are those described in my concurrent application for patent which is a divisional of this application. Such discs are provided with an unequal number of corrugations, the one preferably having two corrugations more than the other. This ensures that the siearing edges of the corrugations shall not all be in operation at the same time, thereby effecting a continuous distribution of the load or stresses during the complete revolution of the disc;

A pedestal 59 for carrying the adjustable bearing 60, for that end. of the driving spindle 4 to which the rotating disc 7 is attached, is shown constructed integral with the frame 1, and the pedestal and bearing 61 for the outer end of'the spindle 4 is also shown constructed integral with the frame 1.

On that end of the driving spindle 4 which enters the grinding chamber 5, there is secured the stock or plate 62 to which the rotating disc '7 is fixed by the set-screws 63- In the inside of that part of the frame which forms the grinding chamber 5, and around the spindle 4 there is formed a recess or recesses 64, to receive an annular plate 65 and leather or like washer 66, to prevent the escape of dust from the chamber 5.

The bearing 60 for that end of the spindle 4 next to the grinding chamber 5, is rendered adjustable laterally by passing the anchor bolts 67 through slots 68 in the top of the frame 1.

i the I of the pedestal and providing adjusting screws 69, which screw through. the side of pedestal 59,and engage with the flat sides of the said anchor bolts 67--see Fig. 5.

The fast and loose pulleys 70. 71, for driving the spindle 4. may, as shown, be

conveniently positioned between the bearings 60, 61.

set-screws fixing cover 73 to the The pedestal and bearing 6l'which supports the outer end of the driving spindle 4, has a white or other suitable metal bush or lining 72. This pedestal and bearing 61 is fitted with a cover 7 3 at the outer end, which cover 73 supports the adjusting means for the rotating disc 7, and also the locking means for the adjusting means. 73 are pedestal and bearing 61. In the end of the spindle 4: there is formed a recess 7e,in which, as usual, one end of the thrust pin 7 5' passes. The. other end of the thrust pin 75 passes into the recess 76 in one end of the adjusting screw 77, which latter screws through a hole 78, tapped in. the cover 73. A hand wheel 79 {upon the outer end of the screw 77 serves for rotating the latter to make any desired adjustment, Upon the screw 77, at the outside of the cover 78, there is arranged a U-shaped locking nut 80, for the screw see Figs. 1 and 6. The ends of this nut are located between projections 81, 82,, formed on the front of the cover 73. In said projections 81, 82, threaded holes 81, 82, are formed in either of which a screw 83 is adapted to be screwed to lock the nut on the screw 77, after adjustment of the disc 7, relative to disc 6. The locking screw 77 is adapted to be positioned at either side of the nut 80 according to the position in which the machine is placed.

For mills of large size, particularly when intended to be used for wet grinding, the shell, casing or that portion of the frame of the mill which provides the grinding chamber would probably be constructed with a central outlet at the bottom for the discharge of the ground product. For dry grinding the outlet at the bottom would probably be made of larger size, and be formed parallel to the sides of the upper portion of the chamber at its widest part. In the case of large mills the invention will probably be found better adapted for dry grinding than for wet grinding.

The adoption of the ball and socket construction in the door for larger mills may render it necessary or desirable to provide several locking devices or arrangements for additionally securing the door. If provided such devices may be of any suitable con struction.

-.As will be readily comprehended from the foregoing description, the function of the ball and socket joint in the door is to admit of the stationary disc adapting or accommodating itself automatically to the revolving disc by moving into truth with the revolving disc when the faces of the discs are brought into contact. After this automatic adjustment has been effected the inner part of the door will ordinarily be secured to the outer and fixed part of the door, by the means and in the 'manner previously ex: plained.

What I claim as my invention and desire to protect by Letters Patent is A mill or machine for grinding or pulverizing ore and other materials, including a door comprising two parts, the inner part of which is adjustable relative to theouter part, the said parts of the door being constructed to form a ball and socket joint between them, a fixed or non-rotating disc attached to the innermovable part of the door, and a revolving disc which cooperates with said fixed disc, the fixed disc being adjustable relative to the rotating disc through the medium of the inner part of the door, as set forth. i

2. A mill or machine for grinding or pulverzing ore and other materials, including a cover or door which comprises anouter part and an inner part, a fixed or non-rotating disc attached to said inner part, said inner and outer parts being constructed so as to form a ball and socket joint between them, the outer part of the door being con structed with a bridge piece which is curved both longitudinally and transversely so that its outer surface is a segment of a sphere whose radius is the same or substantially the same as the inner part of the door and struck from the same centre, and means attached to said inner part of the door and engaging with said bridge piece for adjustably securing the inner part in the outer part, for the purpose set forth.

3. A mill or machine for grinding or pulverzing ore and other materials, including a cover or door which comprises an outer part and an inner part, a fixed or non-rotating disc attached to said inner part, said inner and outer parts being constructed so as to form a ball and socket joint between them, and the outer part of the door being constructed with a bridge piece which is curved both longitudinally and transversely so that its outer surface is a segment of a sphere whose radius is the same or substantially the same as the inner part of the door and struck from the same centre, a bolt, a washer, and a nut, the bridge piece being constructed with a central hole to receive the bolt one end of which is connected to the inner part of the door, the washer and nut being arranged on the outer end of the bolt to retain the inner part of the door in position in the outer part thereof after adjustment, as set forth.

A mill or machine for grinding or pulverzing ore and other materials, including a door comprising two parts, the inner of which is adjustable relative to the outer part, and a fixed or non-rotating disc attached to the inner movable part, the said parts of the door being constructed to form a ball and socket joint between them, and in which the feed box is constructed integral with the inner adjustable part of the door, as set forth.

5. A mill or machine for grinding or pulverizing ore and other materials, in which the door comprises an outer fixed part and an inner adjustable part arranged within said outer part, to which latter part a fixed or non-rotating disc is secured, said parts being constructed so as to form a ball and socket joint between them, and in which the feed box is constructed integral with the inner adjustable part of the door, the outer part of the door having projections to serve as stops for the inner part 01? the door, as set forth.

6. A mill or machine for grinding or pulverizing ore and other materials, including a cover or door which comprises a fixed outer art and an inner adjustable part arranged within said outer part, to which latter part a fixed or non-rotating disc is secured, said parts being constructed so as to form a ball and socket joint between them, and in which the inner part of the door is constructed with recesses, to receive projections formed on the back of the fixed disc, and with a recess to receive portion of the back of said disc, as set forth.

7. In a mill or machine for grinding or pulverizing ore and other materials, including a cover or door which comprises a fixed outer part and an inner adjustablepart arranged within said outer part, to which latter part a fixed or non-rotating disc is secured, and a rotating disc, the combination with adjusting means for the rotating disc, of locking means for said adjusting means, comprising a U-shaped locking nut for the adjusting screw and a screw for locking said locking nut, as set forth In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

RALPH HUSH.

Witnesses:

ARTHUR THOMPSON, EDWARD W. DUNING. 

